yeah, I noticed that too. 5fps isn't quite fast enough for Wakeskating tricks.
However, there is power in timing.. and I'm going back to the basics and shooting more single shots (mainly because I'm running out of hard drive fast! LOL)
One tip for Sequence shots.. shoot in FULL MANUAL for best results. White Balance, f-stop, shutter.. all on manual.
(of course this assumes you know how to use the light meter!)